Han, Meikang Yin, Xiaowei Hantanasirisakul, Kanit Li, Xinliang Iqbal, Aamir Hatter, Christine B. Anasori, Babak Koo, Chong Min Torita, Takeshi Soda, Yoshito Zhang, Litong Cheng, Laifei Gogotsi, Yury 2024-01-19T20:03:20Z 2024-01-19T20:03:20Z 2022-01-10 2019-05 2195-1071 https://pubs.kist.re.kr/handle/201004/120027 Lightweight and mechanically flexible materials that can provide efficient electromagnetic interference (EMI) shielding are highly desirable for protecting portable and smart electronic devices against electromagnetic pollution. Here, the authors report a tunable design of a three-dimensional (3D) porous aerogel structure made of 2D transition metal carbides and a carbonitride (MXene) with a long-range order of aligned lamellar architecture for EMI shielding. Bidirectional freeze-casting of MXene colloidal solutions is used to fabricate robust, compressible and lightweight aerogels, and achieve orientational assembly leading to outstanding EMI shielding performance and tunable ratio of reflection to absorption. EMI shielding effectiveness (SE) of three types of MXene aerogels (Ti3C2Tx, Ti2CTx, and Ti3CNTx) reaches 70.5, 69.2, and 54.1 dB, respectively, while keeping the compression thickness at 1 mm and a density of only approximate to 11.0 mg cm(-3). The highest specific SE reaches 8818.2 dB cm(3) g(-1), which is among the best values reported for EMI shielding materials. More importantly, during the compression process of the MXene aerogels, the ratio of electromagnetic wave reflection to absorption increases without noticeable change of the total EMI SE. Compressible MXene aerogels with aligned layers offer an effective approach to control the electromagnetic wave absorption and reflection in EMI shielding materials. English WILEY-V C H VERLAG GMBH SHIELDING EFFECTIVENESS MICROWAVE-ABSORPTION FOAM COMPOSITES METAL CARBIDES GRAPHENE CARBON LIGHTWEIGHT ULTRALIGHT NANOWIRES Anisotropic MXene Aerogels with a Mechanically Tunable Ratio of Electromagnetic Wave Reflection to Absorption Article 10.1002/adom.201900267 1 ADVANCED OPTICAL MATERIALS, v.7, no.10 ADVANCED OPTICAL MATERIALS 7 10 scie scopus 000471340100024 2-s2.0-85063379312 Materials Science, Multidisciplinary Optics Materials Science Optics Article SHIELDING EFFECTIVENESS MICROWAVE-ABSORPTION FOAM COMPOSITES METAL CARBIDES GRAPHENE CARBON LIGHTWEIGHT ULTRALIGHT NANOWIRES aerogel anisotropy compression electromagnetic wave shielding MXene